Howdy, Dill...
Long time, no see. Great to see you. And great article! Thanks for continuing to share your knowledge and input.
I've grown quite a few of the plants/crops you've mentioned and like them all. Have never grown Willet's though so may have to give it a try.
Abhege, rape is usually grown as a green, often mixed with other greens. Oftentimes a "Southern patch of greens" will consists of a mix of turnips, kale, rape, mustard all sown broadcast-style in a wide row/bed. It sure makes for some good eats!
As for suppliers, Wyatt-Quarles sells quite a few of these recommendations so any garden center that sells W-Quarles stock may have what you are looking for.
Shoe